Spark-plug.



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E. MCCLOY.

SPARK FLUG. PPUCATIQN HLED umg?. 19W.

@wanted Feb. 25, 1%19.

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SIPABK-PLUGu .application lednecember'ao, 191?. serial No. 209,511.

To all eue/icm et mcg/concern:

Be it known that l, EPHRAiMi MoCLoY, a. subject of the Kingof GreatBritain, residin 'at Brooklyn, in the county of Kings and citate of NewYork, have inventedl new 'and useful improvements in Spark-Plugs,

of whichl the following is a specification.

rlfliis invention .relates to spark plugs for internalcombustion'engines and has for its.

principal object, the provision of a priming tube serving as oneterminal andprovided adjacent to the other terminal of the plug with aflared spark augmenting and 'de fleeting passage Whose walls areassociated with said other terminal whereby to produce an annular sparkgap between loo-th terminale.

at the gap end oi the plug and associated with the other terminalwhereby to produce a downward and lateral discharge oi:A the spark andgreatly increase the size of the spark area and positively assure anignition of the explosive charge. thereby.

A still further object of theinvention` is to provide a spark plug whichwill have coupled with an idea of simplicity and durability, anarrangement of. spark terminals which will be 'of a self cleansingcharacter incident to their peculiar formation and re# lation to oneanother.

' iiith the above and vother objects in view which will appear as thenature of the invention is better understood, the same consiste in theimproved construction andnovel.

arrangements of parts which will hereinparticularly pointed out theclaims.

in the accompanying drawings, has been illustrated, a single andpreferred form or the invention, being, however, understood that nolimitations are necessarily made .to the precise structural detailstherein exhibited. but that changes, alterations and modications withinthe scope of the claims may be resorted to when desired.

Figure 1 is a side View of' the plug. Fig. 2 is a vertical sectiontherethrough with parts in'elev'ation.

Fig. $3 a -transverse section on line 3--3 Fig. 4 a transverse sectionon line 'fi-i of Fig. 2.

Specicetlon of Letters Patent.

Another object of the-invention resides in the provision oi a tubularterminal flared Patenten Feb. 25, 1919.

member 5, threaded at its lower end, for

connection with the cylinder of an' internal combustion engine. The saidmember-is p'ro.-

vided with a central. passage 6 through which a porcelain member 7extends, said. member having. a continuousv bore 8, therein throughwhich axtubular terminal 9, extends.'

The said tubular terminal is extended beyond the upper end of the member,7, and the same is threaded at 10, for operative connection with apriming cup 11, having a valve 12, which is adapted to be openedmanually or in any otherl suitable well known manner, so as'to establishcommunication between .the cup and the bore 13, of the mentionedterminal 9. The bore 8, of the member 7 which receives said terminal isflared outwardly as at 14, at its lower end to accommodate itself to acorrespondingly flared end 15, of said terminal 9. In this xmanner, agap pocket or space 16, is prosubstantially iared lower end of theterminal 9, and is positioned axially of thespace 16. In this way, it isobserved that an annular spark.

gap is produced between the flared walls of y the terminal 9, and thebranch 19,/of the otherterminal 17. The minimumA diameter of the spaceor pocket 16, 'is suiiciently calculated with respect to the branch 19,of said terminal 17, so asto prevent the priming/fluid from closing thegap between both terminals so as to positively prevent short circuit aswill be understood. When gasolene or the like is placedin the primingcup, a desired portion thereof can be discharged into the bore oftherterminal 9, where it will flowv to the spark gap and be divided andin a 'manner atomized at the meeting point of the two terminals oftheplug. As a consequence thereof, it will be observed that on theproduction of a spark, the priming fluid will be'promptly ignited andthe fire pro-4 duced by the spark will be scattered in a relativelybroad manner from the base of the plug in the direction of the'explosive chamber of the engine.` This manner of igniting 'the fire andat the same time producing an annular. spark gap with means fordelecting ioo thev same downwardly and laterally, always insures asatisfactory ignition of the eX- plosive charge.

The suction induced in the pocket or space 16, at the time of anexplosion, operates to always clear the terminals ot the plug andpositively prevent carbon from accumulatin yand adhering thereto. From,practice, it 1s found that the .more the plug is used, the more thetwo'terniinals at the spark gap are cleansed incident to this peculiaraction.

What is claimed as new is:-

l. A spark pluglcomprising a metallic body, a porcelain core extendingtherethrough, a tube extending axially through said core, a priming cupthreaded upon the upperen'd of said tube and bearing againstl the end ofsaid core, the lower end of said tube being flared, and a terminalmember core, and a Contact terminal body, a core of insulating materialextending therethrough, a tube extending axially I through said core andhav'ing its lower end flared and terminating Hush with the lower ends ofsai bodyand core, the upper end of said tube extending beyond the upperend of said core and being threaded, a priming cup engagedupon the up erend otfsaid endof said shell and having its free end relexly bent andextending into the ared end of said tube, said inwardly projecting endof said terminal being pointed.

In testimony whereof I afHX my signature. EPHRAlMMCCLOY. A

secured at' one"

